m0n0wall is an all-in-one firewall software
package that is based on FreeBSD. It is geared
towards embedded PCs, but it also works on
standard PCs. It includes an easy-to-use Web
interface like commercial firewall boxes do. PHP
is used instead of shell scripts, and the entire
system configuration is stored in a single
XML-formatted file. There is support for VPN,
traffic shaping, captive portal, VLANs, and more.
